From an ISA Server computer, when you try to check Microsoft or Windows Update from IE, you get the initial page, but when you want to check updates you get a 0x80072EFD error.
To avoid that, configure Internet Explorer proxy to the local ISA Server...

http://support.microsoft.com/default.aspx/kb/827805/en-us explains how to test a distributed transaction scenario between 2 SQL Servers without the need to install DTCPing.
Here is a scenario.
BTS1 server initiates a distributed transaction on...

On a test environment, we had this exception on one of the two BizTalk Server 2004 SP1 nodes:
Ticks must be between DateTime.MinValue.Ticks and DateTime.MaxValue.Ticks. Parameter name: ticks
This was a BizTalk Server 2004 event in Application event...